Methane combustion catalyst, and preparation method and application thereof
A methane combustion and catalyst technology, which is applied in combustion methods, catalyst protection, chemical instruments and methods, etc., can solve problems such as high temperature and easy sintering, and achieve the effects of improving high temperature resistance, improving catalytic combustion performance, and avoiding overflow.
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[0030] The present invention provides the preparation method of the methane combustion catalyst described in the above technical solution, comprising the following steps:
[0031] (1) cobalt tetroxide precursor, templating agent, polyvinylpyrrolidone and hydrogen peroxide are mixed in water, and hydrothermal reaction obtains hydrothermal product;
[0032] (2) mixing the hydrothermal product obtained in the step (1) with a precious metal precursor and a silica precursor, and reacting to obtain a combustion catalyst precursor;
[0033] (3) calcining the combustion catalyst precursor obtained in the step (2) to obtain a combustion catalyst having a core-shell structure.
[0034] In the present invention, a cobalt tetroxide precursor, a template, polyvinylpyrrolidone and hydrogen peroxide are mixed in water, and a hydrothermal reaction is performed to obtain a hydrothermal product. In the present invention, the cobalt tetroxide precursor is preferably a soluble cobalt salt, more ...
Example Embodiment
[0056] Example 1
[0057] The core part of the core-shell catalyst in this embodiment is composed of 1.0wt% Pd, 30.0wt% CO 3 O 4 composition, the rest of the mass is the shell part of SiO 2 .
[0058] The preparation method of the present embodiment is:
[0059] (1) 100ml of cobalt nitrate solution with molar concentration of 0.6mol / L and 20ml of hexamethylenetetramine aqueous solution of 0.05mol / L were mixed uniformly in proportion, and 0.0006mol of polyvinylpyrrolidone and 30ml of 3wt% hydrogen peroxide aqueous solution were added. , 40 ℃ stirring for 4h, stirring revolution 200rpm.
[0060] (2) 80ml PdCl with a mass fraction of 0.2wt% Pd 2 The solution was directly added to the solution described in (1), and the stirring was continued at 45° C. for 1 h, and the stirring revolution was 400 rpm. Then, 128 ml of ethyl orthosilicate ethanol solution with a mass fraction of 50% was added dropwise to the above solution, and the mixture was stirred at 50° C. for 4 hours at a...
Example Embodiment
[0062] Example 2
[0063] The core part of the core-shell catalyst in this embodiment is composed of 0.5wt% Pt, 20.0wt% CO 3 O 4 composition, the rest is the shell part of SiO 2 .
[0064] The preparation method of the present embodiment is:
[0065] (1) Mix 100ml of cobalt nitrate solution with molar concentration of 0.9mol / L and 45ml of 0.05mol / L hexamethylenetetramine aqueous solution in proportion, add 0.0003mol of polyvinylpyrrolidone and 50ml of 15% hydrogen peroxide aqueous solution by mass fraction , 50 ℃ stirring for 7h, stirring revolution 400rpm.
[0066] (2) 36ml of PtCl with a mass fraction of 0.5% Pt 2 solution, directly add the solution described in (1), continue to stir at 50° C. for 2 h, and stir at 300 rpm. Then, 200 ml of ethyl orthosilicate ethanol solution with a mass fraction of 50% was added dropwise to the above solution, and the mixture was stirred at 70° C. for 6 hours at a high rotation number of 850 rpm. Filter and wash, dry at 100°C for 6 ho...
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